These sliding window locks are designed to add an extra layer of safety and control for vertical (up-and-down) and horizontal (side-to-side) sliding windows with flat tracks. They are not compatible with sliding patio doors or window tracks thicker than 0.67 inches. Measuring your window track before purchase is recommended. Installation is simple and tool-free. Each lock clamps securely to the window track using two built-in screws and the included hex key. No drilling or permanent modifications are required. The locks can be adjusted to fully secure the window or to allow a limited opening for safe ventilation. Constructed from durable aluminum alloy, these window locks are built for long-term use and resistance to corrosion. Integrated rubber padding protects window frames from scratches while improving grip and overall stability. These locks help prevent windows from being opened fully, making them ideal for homes with children, pets, apartments, and ground-floor windows. They allow fresh air circulation while reducing the risk of accidental falls or unauthorized entry. This value pack includes multiple locks and bright yellow key handles that are easy to locate and use. For wider windows, multiple locks can be installed to enhance security. Key Features Compatible with vertical and horizontal sliding windows with flat tracks Tool-free installation with built-in dual screws and hex key Durable aluminum alloy construction with corrosion resistance Rubber padding protects window frames and improves stability Helps enhance child, pet, and home safety Adjustable for full lock or limited ventilation Package Includes 4 sliding window locks 4 yellow key handles Built-in rubber protective pads